settimeout | 易学教程

大熊君大话NodeJS之------Global Objects全局对象

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一，开篇分析在上个章节中我们学习了NodeJS的基础理论知识，对于这些理论知识来说理解是至关重要的，在后续的章节中，我们会对照着官方文档逐步学习里面的各部分模块，好了该是本文主角登台亮相的时候了， Global 让我们来看一下官方的定义： Global Objects全局对象 These objects are available in all modules. Some of these objects aren't actually in the global scope but in the module scope - this will be noted. 这些对象在所有的模块中都可用。实际上有些对象并不在全局作用域范围中，但是在它的模块作用域中------这些会标识出来的。 In browsers, the top-level scope is the global scope. That means that in browsers if you're in the global scope var something will define a global variable. In Node this is different. The top-level scope is not the global scope; var something inside a

overriding a global function in javascript

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问题 I am trying to add my own error handling to the JavaScript setTimeout function. The following code works fine in chrome: var oldSetTimeout = window.setTimeout; window.setTimeout = function setTimeout(func, delay) { var args = Array.prototype.slice.call(arguments, 0); args[0] = function timeoutFunction() { var timeoutArgs = Array.prototype.slice.call(arguments, 0); try { func.apply(this,timeoutArgs); } catch (exception) { //Do Error Handling } } return oldSetTimeout.apply(this, args); } But in

js: understanding how alert() impacts browser event loop

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问题 I'm considering adding an alert() to our javascript utility assert function. We're an ajax-heavy application, and the way our framework (Ext) implements ajax by polling for the ajax response with setInterval instead of waiting for readystate==4, causes all of our ajax callbacks to execute in a setInterval stack context -- and an exception/assert blowing out of it usually fails silently. How does a low-level alert() impact the browser event loop? The messagebox by definition must allow the

Run function once per event burst with jQuery

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问题 I'm using jQuery to listen to DOMSubtreeModified event, and then execute a function. What I need is a way to only run a function once per event burst. So in this case, the event will only run after 1 second, and again after 3 seconds. What is the best way to do this? jQuery $(function(){ setTimeout(function(){ $('#container')[0].innerHTML = 'test'; $('#container')[0].innerHTML = 'test'; $('#container')[0].innerHTML = 'test'; $('#container')[0].innerHTML = 'test'; $('#container')[0].innerHTML

Run function once per event burst with jQuery

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Settimeout, bind and this

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问题 Here I have copied code snippet from MDN : https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_objects/Function/bind function LateBloomer() { this.petalCount = Math.ceil(Math.random() * 12) + 1; } // Declare bloom after a delay of 1 second LateBloomer.prototype.bloom = function() { window.setTimeout(this.declare.bind(this), 1000); }; LateBloomer.prototype.declare = function() { console.log('I am a beautiful flower with ' + this.petalCount + ' petals!'); }; var flower = new

urllib2.urlopen will hang forever despite of timeout

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问题 Hope this is quite a simple question, but it's driving me crazy. I'm using Python 2.7.3 on an out of the box installation of ubuntu 12.10 server. I kept zooming on the problem until I got to this snippet: import urllib2 x=urllib2.urlopen("http://casacinema.eu/movie-film-Matrix+trilogy+123+streaming-6165.html", timeout=5) It simply hangs forever, never goes on timeout. I'm evidently doing something wrong. Anybody could please help? Thank you very much indeed! Matteo 回答1: Looks like you are

How to cancel timeout inside of Javascript Promise?

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问题 I'm toying with promises in JavaScript and tried to promisify setTimeout function: function timeout(ms) { return new Promise(function(resolve, reject) { setTimeout(function() { resolve('timeout done'); }, ms); }); } var myPromise=timeout(3000); myPromise.then(function(result) { console.log(result); // timeout done }) Fairly straightforward but I was wondering how would I go about canceling my timeout before the promise resolves. timeout returns Promise object hence I loose access to value

How to cancel timeout inside of Javascript Promise?

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Does the browser keep track of active timer IDs?

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问题 Does the browser keep track of active setInterval and setTimeout IDs? Or is this solely up to the developer to keep track of? If it does keep track of them, is it accessible via the BOM? 回答1: It is up for the developer to keep track of. You can do so by using the returned value of the setTimeout/setInterval function and passing that value to the clearTimeout/clearInterval function - as described in other answers here. This appears to be because each browser will implement keeping track of the